Separating-machine



2 sham-sheet 1 (No Medel.)

N. W. HOLT. SEPARATING MACHINE.

Patented Mer. 11, 189i).

(No Modell) 2 sheetssheen 2.

N. W. HO'LT. SBPARATING MACHINE.

.1 No. 422,941. Patented lvm. 11, 1890.

'of the dust-collector has vertical walls.

UNITED j STATES NOAH VILLIAM HOLT, OF

MANCHESTER, MICH I GAN.

SEPARATING-MACHINE.

SPECIFICATION forming part of Letters raient No. 422,941, dated March 11, 1890.

Application tiled October 26,1888. Serial No. 289,248. (No model.)4

To all whom t may concern:

Be it known that I, NOAH WILLTAM Hour, of Manchester, in the county of Washtenaw and State of Michigan, have invented a new and useful Improvement in Separating-Machines, of which the following is a specifica tion. 1

My improvement is applied to that class of machines commonly known as sieve puri iiers,in which a shaking sieve is placed centrally in a chest or casing, which it divides into two compartments, into the lower one of which air is drawn, which rises through the sieve and the material thereon, raising the specifically light particles and wafting them` away' on the current of air created, generally by a suction, while the fine purified heavier particles pass down through the meshes and the coarser ones pass over the tail of the sieve.

In the annexed drawings, making a part of this specification, Figure 1 is a vertical central section of a combined shaking purier and a centrifugal or cyclone dusteeollector inclosing the purifier on the line f z/ y of Fig. 2. Fig. 2 is a similar section on the line cc of Fig. l. `Fig. 3 is a horizontal section through the purier and dustcollector above the Isieve. Fig. 4 is an elevation, partly in section; and Fig. 5 is an elevation of the hopper forming the lower chamber of the purifier and a modification of the airinduction open 111g. p

The same lettersV are employed in all the. figures in the indication of identical parts.

A is the impervious wall of the well-known centrifugal dust-collector, which is oblong in form and of dimensions suiiicient to contain a shaking sieve and the inclosingcase of a middlings-pnriiier. The upperpart The lower section A2 is converging to form a hopper, down the wall of which the dust deposited by centrifugal action, slides and escapes through a contracted aperture at A.

B is an inner wall parallel to the wall A, extending downward from the cover E of the machine some distance into the converging hopper of thewall A3, and forms a curtain between the inner hopper K and the outer hopper A2. The converging extension is marked B. The intermediate space O forms `the annularportion of the dust-"collecting chamber. IVithin this wall B is a casing D,

extending down from the cover E to or nearly to the plane of the bottom of the vertical walls A and B.

F is a fan, of usual construction, placed over an opening in the cover E and inclosed by a hood H, extending over said opening, with holes neatly fitting the fan-shaft. 'i he `eyes 'of the fan F open into the interior of the chamber within the hood and receive the air drawn from the air-chamber within the casing D.

I is wooden ring extending inwardly from the lower end of the vertical wall B, and to it is fastened the top of a tapering hopper K. It also cuts off communication of the air upward from the chamber formed between Vthe hopper K and the curtain B into the in- `terior of the purifier, except vthrough open ings formed for the purpose.

L is a shaking sieve clothed in the usual manner, which is hung immediately above the hopper K at 'one end by hangers M, attached to the vertically-adjustable plates M', and at the other to the levers N, centrally pivoted to the verticallyadj ustable plates N2, and given an oscillatory movement by connecting-rods N', connecting their upper ends with eccentrics on the fan-shaft. The tail of the shaker delivers the particles too coarse to pass through the sieve and too heavy to be waited awayby the air-current into a transverse trough O, Fig. l, sloping from each end to the middle, so that the tailings shall run down and escape Any of the known devices for keeping the meshes of the sieve open may be employed.

I have shown cylindrical brushes P, which are journaled freely in bars P, which are supported on ways hung in adjustable hangers P2, Figs. l and 2, so that the points of the bristles merely touch the cloth, and being free to revolve on their journals they turn by their contact withthe cloth.

A reciprocating motion is given to the brushes by the following mechanism: Q is a worm-wheel and Q a worm-pinion on the shaft Q2, Figs. 2 and 3. n

Q is on the shaft of a pulley driven by a belt from a small pulley on the fanshaft, and consequently a slow rotation is communicated to the shaft Q2. On the lower `end of the shaft isa crank Q3. The crank-pin passes out of the machine through the tailingroo through a slot in the arm Q4, attached to the brush-bars, so that a slow reciprocating movement will be communicated to the brush.

Purified middlings falling through the meshes of the sieve are caught in the hopper K and run down into a discharge-spout K which is bent to one side and discharges its contents separate from the dust and tailings; but as not all the particles going out through the sieve are of the same grade a cut-off R is placed under the sieve, by which a part of the sifted product falling below the adj ust-able cut-off and running down the side of the hopper will encounter1 the partition T and be discharged through the spout T.

The course of the air is as follows: It enters the chamber below the sieve through holes left by sliding doors or porous cloth S in hopper K, and passes upward through the bolting-cloth on the shaker into the chamber above the sieve, thence through the eyes F into the fan-case, whence it is driven, .laden with dust, out through the discharge-spout F2 into the dust-separating chamber C. Then sweeping around in a descending spiral the dust is deposited upon the surface of the shell h A and falls by gravity to escape at A.

To give access to the shaker and to examy ine the work of separation as it progresses,

openings are formed in the exterior wall A and the interior wall B, connected by trunks G and closed by doors G, Figs. 2 and 4. A similar trunk is also formed for the introduction of the shaker L, which projects outside to receive the feed-middlings. The ends of these trunks are beveled, as shown in Fig. 4, so that the vertical current of air may be divided, part passing over the trunks and part passing below through the intermediate spaces into the hopper, and down the wall A2 until it reaches the lower end of the tapering extension B of the interior wall B, when, its force being spent in a great measure, it will bedrawn up into the space between B and K, and through S into the air-chamber below the shaker, and so on continuously, first passing through the shaker and stratum of material ,carried on it into the upper chamber, then into the fan, then out through the'dust-col# lector, where its dust is deposited, and back into the lower air-chamber of the purifier.

Several very important advantages are gained by the continuous use of the same air, none of which are so well attained by other machines. The air will remain of one temperature,instead of constantly drawing in air warmer or colder. The air will be clean, instead of being filled with dust or particles of soot incident to the use of soft coal. The current being continuous, the fan will work with a minimum of resistance, instead of being compelled, as in the ordinary machine, to blow out its current against the resistance of normal atmospheric pressure. The walls may be made practically air-tight, so that the dust cannot escape into the mill, and so keep its air free from particles of flue dust, which are incident to the work of other dust-collectors,

the. presence of which is not only wasteful but dangerous to health and also liable to cause explosion.

I do not wish to claim in this application any processes or specific constructions which are claimed in any of my pending applications filed as follows: Serial No. 271,134, filed April 9, 1888; No. 272,033, filed April 27, 1888; No. 279,047, filed July 5, 1888; No. 296,349, filed January 11, 1889, and No. 305,716, filed April 2, 1889.

W'hat I claim as myinvention, and desire to secure by Letters Patent, is-

1. The combination of a sieve purifier and an inclosing {hust-collector, a fan drawing air through the former and delivering it tangentially to the latter, and an intermediate curtain B', below which air must iiow in passing from the dust-collector back into the interior of the purifier, substantially as set forth.

2. The combination of a sieve purifier, a centrifugal dust collecting chamber surrounding the purifier, a fan common to the purifier and dust-collector, a trunk connect ing the purifier-chamber and the dust-collecting chamber, and a series of hoppers arranged one within another below the purifier and provided with separate delivery spouts, whereby the different materials are Separately delivered from the machine.

3. The combination of purifier-casing D and sieve L, surrounding walls A B, fan F, communicating with the spaces Within casing D and between the walls A B, hoppers A2, B', and K, the latter provided with openings S, and ring I, connecting the hoppers B and K.

4. The combination of purifier-casing D and sieve L, surrounding walls A B, fan F, communicating with the spaces within casing D and between the walls A B, hoppers A2, B', and K, the latter having openings S, ring I, connecting the hoppers B and K, and cut-off R within the hopper K.

5. The combination of the sieve purifier, the inclosing dust-collector, openings through the walls A and D, connected by trunks G and provided with doors G, whereby access may be had to the interior of the purifier Without interfering with the vertical current in the dust-collector, substantially as set forth.

6. In combination witha sieve purifier and an inclosing dust-collector, a curtain B within said dust-collector, a hopper K within said curtain, and a ring I extending from the curtain B to the upper edge of the hopper K, and serving to prevent the air from rising between and above the upper edge of the hopper.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

NOAH 'VILLIAM HOLT.

Vitnesses:

A. F. FREEMAN, C. WV. CASE.

ICO

ITO 

